Having your well-water tested is more than just a good idea. The Environmental Protection Agency and the Centers for Disease Control & Prevention recommends having well-water tested for coliform bacteria, nitrates, total dissolved solids, and pH levels on a regular basis.
These and other harmful things can get into your water supply and cause many different types of sickness to those who drink it.
Well water should be tested annually at a minimum, usually in the Spring, but any time of the year is good. Water quality can change after a storm, a hard rain, or a harmful environmental event.
While well-water can be among the highest quality water in the world, sometimes it is not fit to drink, even though it looks and tastes pure. Test the water regularly to be sure the water is safe for your family and guests.